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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Expected tax provision at statutory income tax rates	$ 23,046	$ 19,743	$ 18,274
Income taxes at different rates	(10,113)	(9,611)	(5,247)
Research and development tax credits	(5,432)	(4,124)	(2,309)
Executive compensation	3,344	1,835	654
Stock-based compensation	(7,288)	(9,376)	1,794
Deferred tax effects from Tax Act	0	22,325	0
Valuation allowance	1,891	533	1,024
Restructuring charges / (credits)	961	(10)	2
Tax reserves (releases), net	8,269	3,627	(5,570)
Other, net	(1,118)	(1,219)	491
Provision for income taxes	$ 13,560	$ 23,723	$ 9,113

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Effective Income Tax Rate Reconciliation, Income Tax Rate Variation

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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